Adding new trace events
The operating system is shipped instrumented with key events. The user need only activate trace to capture the flow of events from the operating system. Application developers may want to instrument their application code during development for tuning purposes. This provides them with insight into how their applications are interacting with the system.
To add a trace event, you must design the trace records generated by your program in accordance with trace interface conventions. You then add trace-hook macros to the program at the appropriate locations. Traces can then be taken through any of the standard ways of invoking and controlling trace (commands, subcommands, or subroutine calls). To use the trcrpt program to format your traces, add stanzas describing each new trace record and its formatting requirements to the trace format file.